Definitions for second sound
sec·ond sound

WiktionaryRate this definition:0.0 / 0 votes

1. second soundnoun

   A wave of fluctuating temperature or entropy propagated in the superfluid phase of liquid helium

WikipediaRate this definition:0.0 / 0 votes

1. Second sound

   Second sound is a quantum mechanical phenomenon in which heat transfer occurs by wave-like motion, rather than by the more usual mechanism of diffusion. Its presence leads to a very high thermal conductivity. It is known as "second sound" because the wave motion of entropy and temperature is similar to the propagation of pressure waves in air (sound). The phenomenon of second sound was first described by Lev Landau in 1941.Normal sound waves are fluctuations in the displacement and density of molecules in a substance; second sound waves are fluctuations in the density of particle-like thermal excitations (rotons and phonons). Second sound can be observed in any system in which most phonon-phonon collisions conserve momentum, like superfluids and in some dielectric crystals when Umklapp scattering is small. (Umklapp phonon-phonon scattering exchanges momentum with the crystal lattice, so phonon momentum is not conserved.)

WikidataRate this definition:0.0 / 0 votes

1. Second sound

   Second sound is a quantum mechanical phenomenon in which heat transfer occurs by wave-like motion, rather than by the more usual mechanism of diffusion. Heat takes the place of pressure in normal sound waves. This leads to a very high thermal conductivity. It is known as "second sound" because the wave motion of heat is similar to the propagation of sound in air. Normal sound waves are fluctuations in the density of molecules in a substance; second sound waves are fluctuations in the density of phonons. Second sound can be observed in any system in which most phonon-phonon collisions conserve momentum. This occurs in superfluids, and also in some dielectric crystals when Umklapp scattering is small.

How to pronounce second sound?

1. Alex

   US English

   David

   US English

   Mark

   US English

   Daniel

   British

   Libby

   British

   Mia

   British

   Karen

   Australian

   Hayley

   Australian

   Natasha

   Australian

   Veena

   Indian

   Priya

   Indian

   Neerja

   Indian

   Zira

   US English

   Oliver

   British

   Wendy

   British

   Fred

   US English

   Tessa

   South African

How to say second sound in sign language?

Numerology

1. Chaldean Numerology

   The numerical value of second sound in Chaldean Numerology is: 7

2. Pythagorean Numerology

   The numerical value of second sound in Pythagorean Numerology is: 7

Examples of second sound in a Sentence

1. Bernie Sanders:

   The problem is that a lot of these issue are more complicated than a six-second sound byte and a lot of the issues we choose to raise end up in conflict with corporate America and the corporate media, but you know what, we are going to talk about those issues anyhow.

References

1. ^ Wiktionary
   https://en.wiktionary.org/wiki/Second_Sound
2. ^ Wikipedia
   https://en.wikipedia.org/wiki/Second_Sound
3. ^ Wikidata
   https://www.wikidata.org/w/index.php?search=second sound